Martin Still requested a new option for xselect/extractor. Currently the lightcurve output writes times relative to the start bin (ie starting at zero) with the offset from spacecraft time given by the keyword TIMEZERO. Martin wanted the option to have TIMEZERO set to zero so that it is easier to combine lightcurves from different observations. This is now implemented using the extractor boolean parameter lctzero - set this to no for TIMEZERO=0. Within xselect give the argument offset=no to the extract lightcurve command.
Keywords: heasoft, xselect, extractor
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